WYLFA B will be a target for terrorists, anti-nuclear campaigners claimed in Parliament last night.

Dr Carl Clowes warned the site’s close proximity to RAF Valley also meant there was huge potential for disaster, telling MPs there had been a recent near miss of two Hawk jets.

And he insisted the potential for workers in positions of authority to turn on their colleagues, such as the psychiatrist accused of shooting 13 people dead during a rampage at a US army base in November, must also be considered.

Dr Clowes, from People Against Wylfa B (PAWB) was giving evidence to the Commons Energy and Climate Change committee: he reprimanded them for not letting him give evidence in Welsh.

He told the committee: “One of the main concerns, which doesn’t seem to have been addressed adequately, is that it is one minute’s flying time from RAF Valley.

“There are several incidents, sadly, in the last six months of individuals in positions of authority, from France, to Afghanistan to the US turning on their colleagues with disastrous consequences.

“In a similar vein the near miss of two RAF Hawk jets from Valley recently were just 15 metres from each other when they had to take emergency measures.

“I don’t think there is anybody here willing to take a bet there will be no untoward incident involving the Valley site and the proposed Wylfa B location.

“Prevention is better than cure. We must consider that as a possibility.”

Dr Clowes said the fact there are only two points of access and exit from the island was a major issue but evacuating the 66,000 residents in the event of an emergency had not been considered.

The waste from Wylfa B will be twice as hot and twice as radioactive, he also told the committee but was asked by Labour MP David Anderson to provide evidence backing up the claims.

Wylfa B would create 10,000 jobs and pump £2billion in to the local economy, the government has said.